The Pelton turbine works according to the reaction principle. Water ejected from one or several nozzles hits the blades of the blade wheel at very high speed. The Pelton turbine is an impulse turbine in which the water has the same pressure before and after the power output stage. Each blade transmits force to the blade wheel for a short time only. Because of this alternating stress on the blades, there is a risk of fatigue fractures, which is why the wheel is usually manufactured from a single piece of material.
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